package com.sky.service.impl;

import com.alibaba.druid.support.json.JSONUtils;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;


@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    /**
     * 微信登陆
     * @param userLoginDTO
     * @return
     */
    @Autowired
    private WeChatProperties wechatproperties;
    @Autowired
    UserMapper userMapper;

    public User wxLogin(UserLoginDTO userLoginDTO) {

        //调用微信接口服务获得当前微信用户的openid
        String openid = getOpenId(userLoginDTO.getCode());
        //判断openid是否为空，如果为空抛出业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否是一个新用户(判断当前用户的openid是否在用户表里)
        User user = userMapper.getByOpenId(openid);
        if(user == null){
            //如果是新用户，自动完成注册,构造用户信息，保存到用户表里面

            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }



    private String getOpenId(String code) {
        HashMap<String, String> map = new HashMap<>();
        map.put("appid",wechatproperties.getAppid());
        map.put("secret",wechatproperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }

}
